Pokemon: Season 3, Episode 18

Charizard's Burning Ambitions

When Ash hears of the nearby Charicific Valley, he is sure a quick trip would be just the thing to reignite his Charizard's flagging spirits. When they reach the valley, though, they find its dragon denizens anything but cordial. Judged weak, and denied entrance to the valley, Charizard is left more dejected than ever.